674 Part V: Index Options and Futures FUTURES OPTION TRADING STRATEGIES The strategies described here are those that are unique to futures option trading. Although there may be some general relationships to stock and index option strate­ gies, for the most part these strategies apply only to futures options. It will also be shown - in the backspread and ratio spread examples - that one can compute the profitability of an option spread in the same manner, no matter what the underlying instrument is (stocks, futures, etc.) by breaking everything down into "points" and not "dollars." Before getting into specific strategies, it might prove useful to observe some relationships about futures options and their price relationships to each other and to the futures contract itself. Carrying cost and dividends are built into the price of stock and index options, because the underlying instrument pays dividends and one has to pay cash to buy or sell the stock. Such is not the case with futures. The "investment" required to buy a futures contract is not initially a cash outlay. Note that the cost of carry associated with futures generally refers to the carrying cost of owning the cash commodity itself. That carrying cost has no bearing on the price of a futures option other than to determine the futures price itself. Moreover, the future has no divi­ dends or similar payout. This is even true for something like U.S. Treasury bond options, because the interest rate payout of the cash bond is built into the futures price; thus, the option, which is based on the futures price and not directly on the cash price, does not have to allow for carry, since the future itself has no initial car­ rying costs associated with it. Simplistically, it can be stated that: Futures Call = Futures Put + Futures Price - Strike Price Example: April crude oil futures closed at 18.74 ($18.74 per barrel). The following prices exist: Strike April Call April Put Put + Futures Price Price Price - Strike 17 1.80 0.06 1.80 18 0.96 0.22 0.96 19 0.35 0.61 \ 0.35 20 0.10 1.36 0.10 Note that, at every strike, the above formula is true (Call = Put + Futures - Strike). These are not theoretical prices; they were taken from actual settlement prices on a particular trading day.